Acronym for Dynamic Link Library, a library of executable functions or data that can be used by a Windows application. A DLL can be used by several applications at the same time. Some DLLs are provided with the Windows operating system and available for any Windows application. Other DLLs are written for a particular application and are loaded with the application.

Acronym for Enhanced MetaFile. A newer 32-bit version of Windows MetaFile. EMF contains frame information and contain more drawing commands then its predecessor, WMF.

A method to link multiple PDF417 symbols together in order to encode large amount of data.

PDF417 is a multi-row, variable-length symbology with high data capacity and error-correction capability. PDF417 has some unique features which makes it the widely used 2D symbology. A PDF417 symbol can be read by linear scanners, laser scanners or two-dimensional scanners. PDF417 is capable of encoding more than 1100 bytes, 1800 text characters or 2710 digits. Large data files can be encoded into a series of linked PDF417 symbols using a standard methodology referred to as Macro PDF417.

Acronym for Portable Network Graphics. PNG is a bitmap image format that employs lossless data compression.

Acronym for Rich Text Format. A document file developed by Microsoft since 1987 for cross-platform document interchange. Most word processors are able to read and write RTF documents.